src/host/layer23/src/common/l1ctl.c

   1 /* Layer1 control code, talking L1CTL protocol with L1 on the phone */
   2
   3 /* (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
   4  * (C) 2010 by Harald Welte <laforge@gnumonks.org>
   5  *
   6  * All Rights Reserved
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  *
  22  */
  23
  24 #include <stdio.h>
  25 #include <stdint.h>
  26 #include <string.h>
  27 #include <errno.h>
  28
  29 #include <arpa/inet.h>
  30
  31 #include <l1ctl_proto.h>
  32
  33 #include <osmocom/core/signal.h>
  34 #include <osmocom/core/logging.h>
  35 #include <osmocom/core/timer.h>
  36 #include <osmocom/core/msgb.h>
  37 #include <osmocom/gsm/tlv.h>
  38 #include <osmocom/gsm/gsm_utils.h>
  39 #include <osmocom/core/gsmtap_util.h>
  40 #include <osmocom/gsm/protocol/gsm_04_08.h>
  41 #include <osmocom/gsm/protocol/gsm_08_58.h>
  42 #include <osmocom/gsm/rsl.h>
  43
  44 #include <osmocom/bb/common/l1ctl.h>
  45 #include <osmocom/bb/common/osmocom_data.h>
  46 #include <osmocom/bb/common/l1l2_interface.h>
  47 #include <osmocom/bb/common/lapdm.h>
  48 #include <osmocom/bb/common/logging.h>
  49
  50 extern struct gsmtap_inst *gsmtap_inst;
  51
  52 static struct msgb *osmo_l1_alloc(uint8_t msg_type)
  53 {
  54         struct l1ctl_hdr *l1h;
  55         struct msgb *msg = msgb_alloc_headroom(256, 4, "osmo_l1");
  56
  57         if (!msg) {
  58                 LOGP(DL1C, LOGL_ERROR, "Failed to allocate memory.\n");
  59                 return NULL;
  60         }
  61
  62         msg->l1h = msgb_put(msg, sizeof(*l1h));
  63         l1h = (struct l1ctl_hdr *) msg->l1h;
  64         l1h->msg_type = msg_type;
  65
  66         return msg;
  67 }
  68
  69
  70 static int osmo_make_band_arfcn(struct osmocom_ms *ms, uint16_t arfcn)
  71 {
  72         /* TODO: Include the band */
  73         return arfcn;
  74 }
  75
  76 static int rx_l1_fbsb_conf(struct osmocom_ms *ms, struct msgb *msg)
  77 {
  78         struct l1ctl_info_dl *dl;
  79         struct l1ctl_fbsb_conf *sb;
  80         struct gsm_time tm;
  81         struct osmobb_fbsb_res fr;
  82
  83         if (msgb_l3len(msg) < sizeof(*dl) + sizeof(*sb)) {
  84                 LOGP(DL1C, LOGL_ERROR, "FBSB RESP: MSG too short %u\n",
  85                         msgb_l3len(msg));
  86                 return -1;
  87         }
  88
  89         dl = (struct l1ctl_info_dl *) msg->l1h;
  90         sb = (struct l1ctl_fbsb_conf *) dl->payload;
  91
  92         LOGP(DL1C, LOGL_INFO, "snr=%04x, arfcn=%u result=%u\n", dl->snr,
  93                 ntohs(dl->band_arfcn), sb->result);
  94
  95         if (sb->result != 0) {
  96                 LOGP(DL1C, LOGL_ERROR, "FBSB RESP: result=%u\n", sb->result);
  97                 fr.ms = ms;
  98                 fr.band_arfcn = ntohs(dl->band_arfcn);
  99                 osmo_signal_dispatch(SS_L1CTL, S_L1CTL_FBSB_ERR, &fr);
 100                 return 0;
 101         }
 102
 103         gsm_fn2gsmtime(&tm, ntohl(dl->frame_nr));
 104         DEBUGP(DL1C, "SCH: SNR: %u TDMA: (%.4u/%.2u/%.2u) bsic: %d\n",
 105                 dl->snr, tm.t1, tm.t2, tm.t3, sb->bsic);
 106         fr.ms = ms;
 107         fr.snr = dl->snr;
 108         fr.bsic = sb->bsic;
 109         fr.band_arfcn = ntohs(dl->band_arfcn);
 110         osmo_signal_dispatch(SS_L1CTL, S_L1CTL_FBSB_RESP, &fr);
 111
 112         return 0;
 113 }
 114
 115 static int rx_l1_rach_conf(struct osmocom_ms *ms, struct msgb *msg)
 116 {
 117         struct lapdm_entity *le = &ms->lapdm_channel.lapdm_dcch;
 118         struct osmo_phsap_prim pp;
 119         struct l1ctl_info_dl *dl;
 120
 121         if (msgb_l2len(msg) < sizeof(*dl)) {
 122                 LOGP(DL1C, LOGL_ERROR, "RACH CONF: MSG too short %u\n",
 123                         msgb_l3len(msg));
 124                 msgb_free(msg);
 125                 return -1;
 126         }
 127
 128         dl = (struct l1ctl_info_dl *) msg->l1h;
 129
 130         osmo_prim_init(&pp.oph, SAP_GSM_PH, PRIM_PH_RACH,
 131                         PRIM_OP_CONFIRM, msg);
 132         pp.u.rach_ind.fn = ntohl(dl->frame_nr);
 133
 134         return lapdm_phsap_up(&pp.oph, le);
 135 }
 136
 137 /* Receive L1CTL_DATA_IND (Data Indication from L1) */
 138 static int rx_ph_data_ind(struct osmocom_ms *ms, struct msgb *msg)
 139 {
 140         struct osmo_phsap_prim pp;
 141         struct l1ctl_info_dl *dl;
 142         struct l1ctl_data_ind *ccch;
 143         struct lapdm_entity *le;
 144         struct rx_meas_stat *meas = &ms->meas;
 145         uint8_t chan_type, chan_ts, chan_ss;
 146         uint8_t gsmtap_chan_type;
 147         struct gsm_time tm;
 148
 149         if (msgb_l3len(msg) < sizeof(*ccch)) {
 150                 LOGP(DL1C, LOGL_ERROR, "MSG too short Data Ind: %u\n",
 151                         msgb_l3len(msg));
 152                 msgb_free(msg);
 153                 return -1;
 154         }
 155
 156         dl = (struct l1ctl_info_dl *) msg->l1h;
 157         msg->l2h = dl->payload;
 158         ccch = (struct l1ctl_data_ind *) msg->l2h;
 159
 160         gsm_fn2gsmtime(&tm, ntohl(dl->frame_nr));
 161         rsl_dec_chan_nr(dl->chan_nr, &chan_type, &chan_ss, &chan_ts);
 162         DEBUGP(DL1C, "%s (%.4u/%.2u/%.2u) %d dBm: %s\n",
 163                 rsl_chan_nr_str(dl->chan_nr), tm.t1, tm.t2, tm.t3,
 164                 (int)dl->rx_level-110,
 165                 osmo_hexdump(ccch->data, sizeof(ccch->data)));
 166
 167         meas->last_fn = ntohl(dl->frame_nr);
 168         meas->frames++;
 169         meas->snr += dl->snr;
 170         meas->berr += dl->num_biterr;
 171         meas->rxlev += dl->rx_level;
 172
 173         /* counting loss criteria */
 174         if (!(dl->link_id & 0x40)) {
 175                 switch (chan_type) {
 176                 case RSL_CHAN_PCH_AGCH:
 177                         if (!meas->ds_fail)
 178                                 break;
 179                         if (dl->fire_crc >= 2)
 180                                 meas->dsc -= 4;
 181                         else
 182                                 meas->dsc += 1;
 183                         if (meas->dsc > meas->ds_fail)
 184                                 meas->dsc = meas->ds_fail;
 185                         if (meas->dsc < meas->ds_fail)
 186                                 printf("LOSS counter for CCCH %d\n", meas->dsc);
 187                         if (meas->dsc > 0)
 188                                 break;
 189                         meas->ds_fail = 0;
 190                         osmo_signal_dispatch(SS_L1CTL, S_L1CTL_LOSS_IND, ms);
 191                         break;
 192                 }
 193         } else {
 194                 switch (chan_type) {
 195                 case RSL_CHAN_Bm_ACCHs:
 196                 case RSL_CHAN_Lm_ACCHs:
 197                 case RSL_CHAN_SDCCH4_ACCH:
 198                 case RSL_CHAN_SDCCH8_ACCH:
 199                         if (!meas->rl_fail)
 200                                 break;
 201                         if (dl->fire_crc >= 2)
 202                                 meas->s -= 1;
 203                         else
 204                                 meas->s += 2;
 205                         if (meas->s > meas->rl_fail)
 206                                 meas->s = meas->rl_fail;
 207                         if (meas->s < meas->rl_fail)
 208                                 printf("LOSS counter for ACCH %d\n", meas->s);
 209                         if (meas->s > 0)
 210                                 break;
 211                         meas->rl_fail = 0;
 212                         osmo_signal_dispatch(SS_L1CTL, S_L1CTL_LOSS_IND, ms);
 213                         break;
 214                 }
 215         }
 216
 217         if (dl->fire_crc >= 2) {
 218 printf("Dropping frame with %u bit errors\n", dl->num_biterr);
 219                 LOGP(DL1C, LOGL_NOTICE, "Dropping frame with %u bit errors\n",
 220                         dl->num_biterr);
 221                 msgb_free(msg);
 222                 return 0;
 223         }
 224
 225         /* send CCCH data via GSMTAP */
 226         gsmtap_chan_type = chantype_rsl2gsmtap(chan_type, dl->link_id);
 227         gsmtap_send(gsmtap_inst, ntohs(dl->band_arfcn), chan_ts,
 228                     gsmtap_chan_type, chan_ss, tm.fn, dl->rx_level-110,
 229                     dl->snr, ccch->data, sizeof(ccch->data));
 230
 231         /* determine LAPDm entity based on SACCH or not */
 232         if (dl->link_id & 0x40)
 233                 le = &ms->lapdm_channel.lapdm_acch;
 234         else
 235                 le = &ms->lapdm_channel.lapdm_dcch;
 236
 237         /* pull the L1 header from the msgb */
 238         msgb_pull(msg, msg->l2h - (msg->l1h-sizeof(struct l1ctl_hdr)));
 239         msg->l1h = NULL;
 240
 241         osmo_prim_init(&pp.oph, SAP_GSM_PH, PRIM_PH_DATA,
 242                         PRIM_OP_INDICATION, msg);
 243         pp.u.data.chan_nr = dl->chan_nr;
 244         pp.u.data.link_id = dl->link_id;
 245
 246         /* send it up into LAPDm */
 247         return lapdm_phsap_up(&pp.oph, le);
 248 }
 249
 250 /* Receive L1CTL_DATA_CONF (Data Confirm from L1) */
 251 static int rx_ph_data_conf(struct osmocom_ms *ms, struct msgb *msg)
 252 {
 253         struct osmo_phsap_prim pp;
 254         struct l1ctl_info_dl *dl = (struct l1ctl_info_dl *) msg->l1h;
 255         struct lapdm_entity *le;
 256
 257         osmo_prim_init(&pp.oph, SAP_GSM_PH, PRIM_PH_RTS,
 258                         PRIM_OP_INDICATION, msg);
 259
 260         /* determine LAPDm entity based on SACCH or not */
 261         if (dl->link_id & 0x40)
 262                 le = &ms->lapdm_channel.lapdm_acch;
 263         else
 264                 le = &ms->lapdm_channel.lapdm_dcch;
 265
 266         /* send it up into LAPDm */
 267         return lapdm_phsap_up(&pp.oph, le);
 268 }
 269
 270 /* Transmit L1CTL_DATA_REQ */
 271 int l1ctl_tx_data_req(struct osmocom_ms *ms, struct msgb *msg,
 272                       uint8_t chan_nr, uint8_t link_id)
 273 {
 274         struct l1ctl_hdr *l1h;
 275         struct l1ctl_info_ul *l1i_ul;
 276         uint8_t chan_type, chan_ts, chan_ss;
 277         uint8_t gsmtap_chan_type;
 278
 279         DEBUGP(DL1C, "(%s)\n", osmo_hexdump(msg->l2h, msgb_l2len(msg)));
 280
 281         if (msgb_l2len(msg) > 23) {
 282                 LOGP(DL1C, LOGL_ERROR, "L1 cannot handle message length "
 283                         "> 23 (%u)\n", msgb_l2len(msg));
 284                 msgb_free(msg);
 285                 return -EINVAL;
 286         } else if (msgb_l2len(msg) < 23)
 287                 LOGP(DL1C, LOGL_ERROR, "L1 message length < 23 (%u) "
 288                         "doesn't seem right!\n", msgb_l2len(msg));
 289
 290         /* send copy via GSMTAP */
 291         rsl_dec_chan_nr(chan_nr, &chan_type, &chan_ss, &chan_ts);
 292         gsmtap_chan_type = chantype_rsl2gsmtap(chan_type, link_id);
 293         gsmtap_send(gsmtap_inst, 0|0x4000, chan_ts, gsmtap_chan_type,
 294                     chan_ss, 0, 127, 255, msg->l2h, msgb_l2len(msg));
 295
 296         /* prepend uplink info header */
 297         l1i_ul = (struct l1ctl_info_ul *) msgb_push(msg, sizeof(*l1i_ul));
 298
 299         l1i_ul->chan_nr = chan_nr;
 300         l1i_ul->link_id = link_id;
 301
 302         /* prepend l1 header */
 303         msg->l1h = msgb_push(msg, sizeof(*l1h));
 304         l1h = (struct l1ctl_hdr *) msg->l1h;
 305         l1h->msg_type = L1CTL_DATA_REQ;
 306
 307         return osmo_send_l1(ms, msg);
 308 }
 309
 310 /* Transmit FBSB_REQ */
 311 int l1ctl_tx_fbsb_req(struct osmocom_ms *ms, uint16_t arfcn,
 312                       uint8_t flags, uint16_t timeout, uint8_t sync_info_idx,
 313                       uint8_t ccch_mode)
 314 {
 315         struct msgb *msg;
 316         struct l1ctl_fbsb_req *req;
 317
 318         LOGP(DL1C, LOGL_INFO, "Sync Req\n");
 319
 320         msg = osmo_l1_alloc(L1CTL_FBSB_REQ);
 321         if (!msg)
 322                 return -1;
 323
 324         req = (struct l1ctl_fbsb_req *) msgb_put(msg, sizeof(*req));
 325         req->band_arfcn = htons(osmo_make_band_arfcn(ms, arfcn));
 326         req->timeout = htons(timeout);
 327         /* Threshold when to consider FB_MODE1: 4kHz - 1kHz */
 328         req->freq_err_thresh1 = htons(11000 - 1000);
 329         /* Threshold when to consider SCH: 1kHz - 200Hz */
 330         req->freq_err_thresh2 = htons(1000 - 200);
 331         /* not used yet! */
 332         req->num_freqerr_avg = 3;
 333         req->flags = flags;
 334         req->sync_info_idx = sync_info_idx;
 335         req->ccch_mode = ccch_mode;
 336
 337         return osmo_send_l1(ms, msg);
 338 }
 339
 340 /* Transmit L1CTL_CCCH_MODE_REQ */
 341 int l1ctl_tx_ccch_mode_req(struct osmocom_ms *ms, uint8_t ccch_mode)
 342 {
 343         struct msgb *msg;
 344         struct l1ctl_ccch_mode_req *req;
 345
 346         LOGP(DL1C, LOGL_INFO, "CCCH Mode Req\n");
 347
 348         msg = osmo_l1_alloc(L1CTL_CCCH_MODE_REQ);
 349         if (!msg)
 350                 return -1;
 351
 352         req = (struct l1ctl_ccch_mode_req *) msgb_put(msg, sizeof(*req));
 353         req->ccch_mode = ccch_mode;
 354
 355         return osmo_send_l1(ms, msg);
 356 }
 357
 358 /* Transmit L1CTL_TCH_MODE_REQ */
 359 int l1ctl_tx_tch_mode_req(struct osmocom_ms *ms, uint8_t tch_mode)
 360 {
 361         struct msgb *msg;
 362         struct l1ctl_tch_mode_req *req;
 363
 364         LOGP(DL1C, LOGL_INFO, "TCH Mode Req\n");
 365
 366         msg = osmo_l1_alloc(L1CTL_TCH_MODE_REQ);
 367         if (!msg)
 368                 return -1;
 369
 370         req = (struct l1ctl_tch_mode_req *) msgb_put(msg, sizeof(*req));
 371         req->tch_mode = tch_mode;
 372
 373         return osmo_send_l1(ms, msg);
 374 }
 375
 376 /* Transmit L1CTL_PARAM_REQ */
 377 int l1ctl_tx_param_req(struct osmocom_ms *ms, uint8_t ta, uint8_t tx_power)
 378 {
 379         struct msgb *msg;
 380         struct l1ctl_info_ul *ul;
 381         struct l1ctl_par_req *req;
 382
 383         msg = osmo_l1_alloc(L1CTL_PARAM_REQ);
 384         if (!msg)
 385                 return -1;
 386
 387         DEBUGP(DL1C, "PARAM Req. ta=%d, tx_power=%d\n", ta, tx_power);
 388         ul = (struct l1ctl_info_ul *) msgb_put(msg, sizeof(*ul));
 389         req = (struct l1ctl_par_req *) msgb_put(msg, sizeof(*req));
 390         req->tx_power = tx_power;
 391         req->ta = ta;
 392
 393         return osmo_send_l1(ms, msg);
 394 }
 395
 396 /* Transmit L1CTL_CRYPTO_REQ */
 397 int l1ctl_tx_crypto_req(struct osmocom_ms *ms, uint8_t algo, uint8_t *key,
 398         uint8_t len)
 399 {
 400         struct msgb *msg;
 401         struct l1ctl_info_ul *ul;
 402         struct l1ctl_crypto_req *req;
 403
 404         msg = osmo_l1_alloc(L1CTL_CRYPTO_REQ);
 405         if (!msg)
 406                 return -1;
 407
 408         DEBUGP(DL1C, "CRYPTO Req. algo=%d, len=%d\n", algo, len);
 409         ul = (struct l1ctl_info_ul *) msgb_put(msg, sizeof(*ul));
 410         req = (struct l1ctl_crypto_req *) msgb_put(msg, sizeof(*req) + len);
 411         req->algo = algo;
 412         if (len)
 413                 memcpy(req->key, key, len);
 414
 415         return osmo_send_l1(ms, msg);
 416 }
 417
 418 /* Transmit L1CTL_RACH_REQ */
 419 int l1ctl_tx_rach_req(struct osmocom_ms *ms, uint8_t ra, uint16_t offset,
 420         uint8_t combined)
 421 {
 422         struct msgb *msg;
 423         struct l1ctl_info_ul *ul;
 424         struct l1ctl_rach_req *req;
 425
 426         msg = osmo_l1_alloc(L1CTL_RACH_REQ);
 427         if (!msg)
 428                 return -1;
 429
 430         DEBUGP(DL1C, "RACH Req. offset=%d combined=%d\n", offset, combined);
 431         ul = (struct l1ctl_info_ul *) msgb_put(msg, sizeof(*ul));
 432         req = (struct l1ctl_rach_req *) msgb_put(msg, sizeof(*req));
 433         req->ra = ra;
 434         req->offset = htons(offset);
 435         req->combined = combined;
 436
 437         return osmo_send_l1(ms, msg);
 438 }
 439
 440 /* Transmit L1CTL_DM_EST_REQ */
 441 int l1ctl_tx_dm_est_req_h0(struct osmocom_ms *ms, uint16_t band_arfcn,
 442                            uint8_t chan_nr, uint8_t tsc, uint8_t tch_mode)
 443 {
 444         struct msgb *msg;
 445         struct l1ctl_info_ul *ul;
 446         struct l1ctl_dm_est_req *req;
 447
 448         msg = osmo_l1_alloc(L1CTL_DM_EST_REQ);
 449         if (!msg)
 450                 return -1;
 451
 452         LOGP(DL1C, LOGL_INFO, "Tx Dedic.Mode Est Req (arfcn=%u, "
 453                 "chan_nr=0x%02x)\n", band_arfcn, chan_nr);
 454
 455         ul = (struct l1ctl_info_ul *) msgb_put(msg, sizeof(*ul));
 456         ul->chan_nr = chan_nr;
 457         ul->link_id = 0;
 458
 459         req = (struct l1ctl_dm_est_req *) msgb_put(msg, sizeof(*req));
 460         req->tsc = tsc;
 461         req->h = 0;
 462         req->h0.band_arfcn = htons(band_arfcn);
 463         req->tch_mode = tch_mode;
 464
 465         return osmo_send_l1(ms, msg);
 466 }
 467
 468 int l1ctl_tx_dm_est_req_h1(struct osmocom_ms *ms, uint8_t maio, uint8_t hsn,
 469                            uint16_t *ma, uint8_t ma_len,
 470                            uint8_t chan_nr, uint8_t tsc, uint8_t tch_mode)
 471 {
 472         struct msgb *msg;
 473         struct l1ctl_info_ul *ul;
 474         struct l1ctl_dm_est_req *req;
 475         int i;
 476
 477         msg = osmo_l1_alloc(L1CTL_DM_EST_REQ);
 478         if (!msg)
 479                 return -1;
 480
 481         LOGP(DL1C, LOGL_INFO, "Tx Dedic.Mode Est Req (maio=%u, hsn=%u, "
 482                 "chan_nr=0x%02x)\n", maio, hsn, chan_nr);
 483
 484         ul = (struct l1ctl_info_ul *) msgb_put(msg, sizeof(*ul));
 485         ul->chan_nr = chan_nr;
 486         ul->link_id = 0;
 487
 488         req = (struct l1ctl_dm_est_req *) msgb_put(msg, sizeof(*req));
 489         req->tsc = tsc;
 490         req->h = 1;
 491         req->h1.maio = maio;
 492         req->h1.hsn = hsn;
 493         req->h1.n = ma_len;
 494         for (i = 0; i < ma_len; i++)
 495                 req->h1.ma[i] = htons(ma[i]);
 496         req->tch_mode = tch_mode;
 497
 498         return osmo_send_l1(ms, msg);
 499 }
 500
 501 /* Transmit L1CTL_DM_FREQ_REQ */
 502 int l1ctl_tx_dm_freq_req_h0(struct osmocom_ms *ms, uint16_t band_arfcn,
 503                             uint8_t tsc, uint16_t fn)
 504 {
 505         struct msgb *msg;
 506         struct l1ctl_info_ul *ul;
 507         struct l1ctl_dm_freq_req *req;
 508
 509         msg = osmo_l1_alloc(L1CTL_DM_FREQ_REQ);
 510         if (!msg)
 511                 return -1;
 512
 513         LOGP(DL1C, LOGL_INFO, "Tx Dedic.Mode Freq Req (arfcn=%u, fn=%d)\n",
 514                 band_arfcn, fn);
 515
 516         ul = (struct l1ctl_info_ul *) msgb_put(msg, sizeof(*ul));
 517         ul->chan_nr = 0;
 518         ul->link_id = 0;
 519
 520         req = (struct l1ctl_dm_freq_req *) msgb_put(msg, sizeof(*req));
 521         req->fn = htons(fn);
 522         req->tsc = tsc;
 523         req->h = 0;
 524         req->h0.band_arfcn = htons(band_arfcn);
 525
 526         return osmo_send_l1(ms, msg);
 527 }
 528
 529 int l1ctl_tx_dm_freq_req_h1(struct osmocom_ms *ms, uint8_t maio, uint8_t hsn,
 530                             uint16_t *ma, uint8_t ma_len,
 531                             uint8_t tsc, uint16_t fn)
 532 {
 533         struct msgb *msg;
 534         struct l1ctl_info_ul *ul;
 535         struct l1ctl_dm_freq_req *req;
 536         int i;
 537
 538         msg = osmo_l1_alloc(L1CTL_DM_FREQ_REQ);
 539         if (!msg)
 540                 return -1;
 541
 542         LOGP(DL1C, LOGL_INFO, "Tx Dedic.Mode Freq Req (maio=%u, hsn=%u, "
 543                 "fn=%d)\n", maio, hsn, fn);
 544
 545         ul = (struct l1ctl_info_ul *) msgb_put(msg, sizeof(*ul));
 546         ul->chan_nr = 0;
 547         ul->link_id = 0;
 548
 549         req = (struct l1ctl_dm_freq_req *) msgb_put(msg, sizeof(*req));
 550         req->fn = htons(fn);
 551         req->tsc = tsc;
 552         req->h = 1;
 553         req->h1.maio = maio;
 554         req->h1.hsn = hsn;
 555         req->h1.n = ma_len;
 556         for (i = 0; i < ma_len; i++)
 557                 req->h1.ma[i] = htons(ma[i]);
 558
 559         return osmo_send_l1(ms, msg);
 560 }
 561
 562 /* Transmit L1CTL_DM_REL_REQ */
 563 int l1ctl_tx_dm_rel_req(struct osmocom_ms *ms)
 564 {
 565         struct msgb *msg;
 566         struct l1ctl_info_ul *ul;
 567
 568         msg = osmo_l1_alloc(L1CTL_DM_REL_REQ);
 569         if (!msg)
 570                 return -1;
 571
 572         LOGP(DL1C, LOGL_INFO, "Tx Dedic.Mode Rel Req\n");
 573
 574         ul = (struct l1ctl_info_ul *) msgb_put(msg, sizeof(*ul));
 575
 576         return osmo_send_l1(ms, msg);
 577 }
 578
 579 int l1ctl_tx_echo_req(struct osmocom_ms *ms, unsigned int len)
 580 {
 581         struct msgb *msg;
 582         uint8_t *data;
 583         unsigned int i;
 584
 585         msg = osmo_l1_alloc(L1CTL_ECHO_REQ);
 586         if (!msg)
 587                 return -1;
 588
 589         data = msgb_put(msg, len);
 590         for (i = 0; i < len; i++)
 591                 data[i] = i % 8;
 592
 593         return osmo_send_l1(ms, msg);
 594 }
 595
 596 int l1ctl_tx_sim_req(struct osmocom_ms *ms, uint8_t *data, uint16_t length)
 597 {
 598         struct msgb *msg;
 599         uint8_t *dat;
 600
 601         msg = osmo_l1_alloc(L1CTL_SIM_REQ);
 602         if (!msg)
 603                 return -1;
 604
 605         dat = msgb_put(msg, length);
 606         memcpy(dat, data, length);
 607
 608         return osmo_send_l1(ms, msg);
 609 }
 610
 611 /* just forward the SIM response to the SIM handler */
 612 static int rx_l1_sim_conf(struct osmocom_ms *ms, struct msgb *msg)
 613 {
 614         uint16_t len = msg->len - sizeof(struct l1ctl_hdr);
 615         uint8_t *data = msg->data + sizeof(struct l1ctl_hdr);
 616
 617         LOGP(DL1C, LOGL_INFO, "SIM %s\n", osmo_hexdump(data, len));
 618
 619         /* pull the L1 header from the msgb */
 620         msgb_pull(msg, sizeof(struct l1ctl_hdr));
 621         msg->l1h = NULL;
 622
 623         sim_apdu_resp(ms, msg);
 624
 625         return 0;
 626 }
 627
 628 /* Transmit L1CTL_PM_REQ */
 629 int l1ctl_tx_pm_req_range(struct osmocom_ms *ms, uint16_t arfcn_from,
 630                           uint16_t arfcn_to)
 631 {
 632         struct msgb *msg;
 633         struct l1ctl_pm_req *pm;
 634
 635         msg = osmo_l1_alloc(L1CTL_PM_REQ);
 636         if (!msg)
 637                 return -1;
 638
 639         LOGP(DL1C, LOGL_INFO, "Tx PM Req (%u-%u)\n", arfcn_from, arfcn_to);
 640         pm = (struct l1ctl_pm_req *) msgb_put(msg, sizeof(*pm));
 641         pm->type = 1;
 642         pm->range.band_arfcn_from = htons(arfcn_from);
 643         pm->range.band_arfcn_to = htons(arfcn_to);
 644
 645         return osmo_send_l1(ms, msg);
 646 }
 647
 648 /* Transmit L1CTL_RESET_REQ */
 649 int l1ctl_tx_reset_req(struct osmocom_ms *ms, uint8_t type)
 650 {
 651         struct msgb *msg;
 652         struct l1ctl_reset *res;
 653
 654         msg = osmo_l1_alloc(L1CTL_RESET_REQ);
 655         if (!msg)
 656                 return -1;
 657
 658         LOGP(DL1C, LOGL_INFO, "Tx Reset Req (%u)\n", type);
 659         res = (struct l1ctl_reset *) msgb_put(msg, sizeof(*res));
 660         res->type = type;
 661
 662         return osmo_send_l1(ms, msg);
 663 }
 664
 665 /* Receive L1CTL_RESET_IND */
 666 static int rx_l1_reset(struct osmocom_ms *ms)
 667 {
 668         LOGP(DL1C, LOGL_INFO, "Layer1 Reset indication\n");
 669         osmo_signal_dispatch(SS_L1CTL, S_L1CTL_RESET, ms);
 670
 671         return 0;
 672 }
 673
 674 /* Receive L1CTL_PM_CONF */
 675 static int rx_l1_pm_conf(struct osmocom_ms *ms, struct msgb *msg)
 676 {
 677         struct l1ctl_pm_conf *pmr;
 678
 679         for (pmr = (struct l1ctl_pm_conf *) msg->l1h;
 680              (uint8_t *) pmr < msg->tail; pmr++) {
 681                 struct osmobb_meas_res mr;
 682                 DEBUGP(DL1C, "PM MEAS: ARFCN: %4u RxLev: %3d %3d\n",
 683                         ntohs(pmr->band_arfcn), pmr->pm[0], pmr->pm[1]);
 684                 mr.band_arfcn = ntohs(pmr->band_arfcn);
 685                 mr.rx_lev = pmr->pm[0];
 686                 mr.ms = ms;
 687                 osmo_signal_dispatch(SS_L1CTL, S_L1CTL_PM_RES, &mr);
 688         }
 689         return 0;
 690 }
 691
 692 /* Receive L1CTL_CCCH_MODE_CONF */
 693 static int rx_l1_ccch_mode_conf(struct osmocom_ms *ms, struct msgb *msg)
 694 {
 695         struct osmobb_ccch_mode_conf mc;
 696         struct l1ctl_ccch_mode_conf *conf;
 697
 698         if (msgb_l3len(msg) < sizeof(*conf)) {
 699                 LOGP(DL1C, LOGL_ERROR, "CCCH MODE CONF: MSG too short %u\n",
 700                         msgb_l3len(msg));
 701                 return -1;
 702         }
 703
 704         conf = (struct l1ctl_ccch_mode_conf *) msg->l1h;
 705
 706         LOGP(DL1C, LOGL_INFO, "CCCH MODE CONF: mode=%u\n", conf->ccch_mode);
 707
 708         mc.ccch_mode = conf->ccch_mode;
 709         mc.ms = ms;
 710         osmo_signal_dispatch(SS_L1CTL, S_L1CTL_CCCH_MODE_CONF, &mc);
 711
 712         return 0;
 713 }
 714
 715 /* Receive L1CTL_TCH_MODE_CONF */
 716 static int rx_l1_tch_mode_conf(struct osmocom_ms *ms, struct msgb *msg)
 717 {
 718         struct osmobb_tch_mode_conf mc;
 719         struct l1ctl_tch_mode_conf *conf;
 720
 721         if (msgb_l3len(msg) < sizeof(*conf)) {
 722                 LOGP(DL1C, LOGL_ERROR, "TCH MODE CONF: MSG too short %u\n",
 723                         msgb_l3len(msg));
 724                 return -1;
 725         }
 726
 727         conf = (struct l1ctl_tch_mode_conf *) msg->l1h;
 728
 729         LOGP(DL1C, LOGL_INFO, "TCH MODE CONF: mode=%u\n", conf->tch_mode);
 730
 731         mc.tch_mode = conf->tch_mode;
 732         mc.ms = ms;
 733         osmo_signal_dispatch(SS_L1CTL, S_L1CTL_TCH_MODE_CONF, &mc);
 734
 735         return 0;
 736 }
 737
 738 /* Transmit L1CTL_NEIGH_PM_REQ */
 739 int l1ctl_tx_neigh_pm_req(struct osmocom_ms *ms, int num, uint16_t *arfcn)
 740 {
 741         struct msgb *msg;
 742         struct l1ctl_neigh_pm_req *pm_req;
 743         int i;
 744
 745         msg = osmo_l1_alloc(L1CTL_NEIGH_PM_REQ);
 746         if (!msg)
 747                 return -1;
 748
 749         LOGP(DL1C, LOGL_INFO, "Tx NEIGH PM Req (num %u)\n", num);
 750         pm_req = (struct l1ctl_neigh_pm_req *) msgb_put(msg, sizeof(*pm_req));
 751         pm_req->n = num;
 752         for (i = 0; i < num; i++)
 753                 pm_req->band_arfcn[i] = htons(*arfcn++);
 754
 755         return osmo_send_l1(ms, msg);
 756 }
 757
 758 /* Receive L1CTL_NEIGH_PM_IND */
 759 static int rx_l1_neigh_pm_ind(struct osmocom_ms *ms, struct msgb *msg)
 760 {
 761         struct l1ctl_neigh_pm_ind *pm_ind;
 762
 763         for (pm_ind = (struct l1ctl_neigh_pm_ind *) msg->l1h;
 764              (uint8_t *) pm_ind < msg->tail; pm_ind++) {
 765                 struct osmobb_neigh_pm_ind mi;
 766                 DEBUGP(DL1C, "NEIGH_PM IND: ARFCN: %4u RxLev: %3d %3d\n",
 767                         ntohs(pm_ind->band_arfcn), pm_ind->pm[0],
 768                         pm_ind->pm[1]);
 769                 mi.band_arfcn = ntohs(pm_ind->band_arfcn);
 770                 mi.rx_lev = pm_ind->pm[0];
 771                 mi.ms = ms;
 772                 osmo_signal_dispatch(SS_L1CTL, S_L1CTL_NEIGH_PM_IND, &mi);
 773         }
 774         return 0;
 775 }
 776
 777 /* Receive incoming data from L1 using L1CTL format */
 778 int l1ctl_recv(struct osmocom_ms *ms, struct msgb *msg)
 779 {
 780         int rc = 0;
 781         struct l1ctl_hdr *l1h;
 782         struct l1ctl_info_dl *dl;
 783
 784         if (msgb_l2len(msg) < sizeof(*dl)) {
 785                 LOGP(DL1C, LOGL_ERROR, "Short Layer2 message: %u\n",
 786                         msgb_l2len(msg));
 787                 msgb_free(msg);
 788                 return -1;
 789         }
 790
 791         l1h = (struct l1ctl_hdr *) msg->l1h;
 792
 793         /* move the l1 header pointer to point _BEHIND_ l1ctl_hdr,
 794            as the l1ctl header is of no interest to subsequent code */
 795         msg->l1h = l1h->data;
 796
 797         switch (l1h->msg_type) {
 798         case L1CTL_FBSB_CONF:
 799                 rc = rx_l1_fbsb_conf(ms, msg);
 800                 msgb_free(msg);
 801                 break;
 802         case L1CTL_DATA_IND:
 803                 rc = rx_ph_data_ind(ms, msg);
 804                 break;
 805         case L1CTL_DATA_CONF:
 806                 rc = rx_ph_data_conf(ms, msg);
 807                 break;
 808         case L1CTL_RESET_IND:
 809         case L1CTL_RESET_CONF:
 810                 rc = rx_l1_reset(ms);
 811                 msgb_free(msg);
 812                 break;
 813         case L1CTL_PM_CONF:
 814                 rc = rx_l1_pm_conf(ms, msg);
 815                 if (l1h->flags & L1CTL_F_DONE)
 816                         osmo_signal_dispatch(SS_L1CTL, S_L1CTL_PM_DONE, ms);
 817                 msgb_free(msg);
 818                 break;
 819         case L1CTL_RACH_CONF:
 820                 rc = rx_l1_rach_conf(ms, msg);
 821                 break;
 822         case L1CTL_CCCH_MODE_CONF:
 823                 rc = rx_l1_ccch_mode_conf(ms, msg);
 824                 msgb_free(msg);
 825                 break;
 826         case L1CTL_TCH_MODE_CONF:
 827                 rc = rx_l1_tch_mode_conf(ms, msg);
 828                 msgb_free(msg);
 829                 break;
 830         case L1CTL_SIM_CONF:
 831                 rc = rx_l1_sim_conf(ms, msg);
 832                 break;
 833         case L1CTL_NEIGH_PM_IND:
 834                 rc = rx_l1_neigh_pm_ind(ms, msg);
 835                 msgb_free(msg);
 836                 break;
 837         default:
 838                 LOGP(DL1C, LOGL_ERROR, "Unknown MSG: %u\n", l1h->msg_type);
 839                 msgb_free(msg);
 840                 break;
 841         }
 842
 843         return rc;
 844 }